KR20030061117A - Apparatus for preventing vacuum compression of scroll compressor - Google Patents

Abstract

PURPOSE: An apparatus for preventing high vacuum compression of a scroll compressor is provided to prevent compression gas in a discharge pressure area from leaking to a suction pressure area during normal operation while allowing compression gas in the discharge pressure area to flow back to the suction pressure area during abnormal operation. CONSTITUTION: An apparatus comprises a fixed scroll forming a plurality of compression chambers successively moving together with a rotary scroll, a middle pressure hole connected with one of the compression chambers in a middle pressure area, and a suction pressure hole connected with a suction pressure area; a valve housing(110) having a valve receiving space(111), fixed to the fixed scroll to receive both of the middle pressure hole and the suction pressure hole in the valve receiving space, and forming a discharge pressure hole(143) selectively connected with the middle pressure hole and the suction pressure hole; and a check valve(120) inserted to the valve receiving space to rotate, and rotated depending on pressure of fluid introduced into the valve receiving space to selectively connect the middle pressure hole, the suction pressure hole and the discharge pressure hole.

Description

High vacuum prevention device of scroll compressor {APPARATUS FOR PREVENTING VACUUM COMPRESSION OF SCROLL COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high vacuum prevention apparatus of a scroll compressor, and more particularly, to a high vacuum prevention apparatus of a scroll compressor which can prevent the compressed gas of the discharge chamber from leaking into the suction region or the intermediate pressure chamber during operation.

As is known, a scroll compressor traps a gas between two helical grooves and compresses the gas by rotation. Such a scroll compressor is mounted on the main frame 1 and fixed as shown in FIG. The main frame 1 and the fixed scroll 2 having a fixed scroll 2 having a spiral wrap 2a and a spiral wrap 3a engaged with and engaged with the wrap 2a of the fixed scroll 2. A pair of compression chambers (P) between the wrap (2a) and the wrap (3a) while the orbiting scroll (3) is pivoting with respect to the fixed scroll (2). (P) and the pair of compression chambers (P) move continuously toward the center during the turning movement of the turning scroll (3), the volume gradually decreases to compress the gas in the compression chamber (P) and then the refrigeration system To discharge.

In this process, all the refrigerant gas remaining in the suction pressure region S1 is compressed in the compression chamber P during the overcompression operation due to the abnormality of the refrigeration system or during the pump-down operation in which the suction service valve (not shown) is locked. And suctioned into the discharge pressure zone S3 after compression, so that the suction pressure zone S1 and the compression chamber P of the casing C are gradually evacuated and the Hermetic Terminal (not shown) burns out. Or the tip thread deteriorated.

In view of this, in the related art, as shown in FIG. 2, the back pressure passage 10 communicating the suction pressure area S1, the intermediate pressure area S2, and the discharge pressure area S3 with each other around the discharge port 2c of the fixed scroll 2. ) And slides the piston (20) to selectively communicate each region in the back pressure passage (10), and the compression coil spring (30) to assist the opening and closing operation of the piston (20) It arrange | positions on one side of 20, and comprises the high vacuum prevention apparatus.

In the figure, 2b is an inlet, 4 is a rotating shaft, 5 is a high and low pressure separator, 6 is a check valve assembly, 11 is a suction pressure hole, 12 is a middle pressure hole, 13 is a discharge pressure hole, 40 is a stopper, SP Is a suction pipe and DP is a discharge pipe.

This means that during operation of the compressor, as shown in FIG. 2, the piston 20 is pushed by the pressure in the intermediate pressure region S2 to block the discharge pressure hole 13 so that the compressed gas in the discharge pressure region S3 is sucked in the suction pressure region S1. In the reverse compression or pump down operation of the compressor, the pressure in the intermediate pressure region S2 is lower than the restoring force of the compression coil spring 30 pressed by the piston 20, as shown in FIG. As the piston 20 slides, the discharge pressure hole 13 opens and the compressed gas in the discharge pressure area S3 flows back into the suction pressure area S1 through the suction pressure hole 11 of the stopper 40. It was to prevent the compression chamber P from evacuating.

However, the high vacuum prevention device of the conventional scroll compressor as described above, according to the elastic coefficient of the compression coil spring (30) together with the pressure difference between the piston 20 as the blocking member between the suction pressure region (S1) and the intermediate pressure region (S2). It is configured to slide, but since the gap (gap) must be formed for the sliding movement of the actual piston 20, the compressed gas in the discharge pressure region (S3) to the suction pressure region (S1) during normal operation through this gap. There was a problem that the leak or compressed gas in the intermediate pressure region (S2) leaks into the suction pressure region (S1).

The present invention has been made in view of the above problems of the high vacuum prevention apparatus of the conventional scroll compressor, and during normal operation, it is possible to block the leakage of the compressed gas in the discharge pressure region to the suction pressure region, while overcompressing or pumping down. In an abnormal operation as described above, an object of the present invention is to provide an apparatus for preventing high vacuum of a scroll compressor capable of smoothly flowing back the compressed gas in the discharge pressure region to the suction pressure region.

1 is a longitudinal sectional view showing a part of a conventional scroll compressor.

2 and 3 are longitudinal cross-sectional view showing the operation of the high vacuum prevention apparatus in the conventional scroll compressor.

Figure 4 is a longitudinal sectional view showing a part of the scroll compressor of the present invention.

Figure 5 is a longitudinal sectional view showing an enlarged high vacuum prevention apparatus in the scroll compressor of the present invention.

Figure 6 is an exploded perspective view showing a high vacuum prevention apparatus in the scroll compressor of the present invention.

7 to 10 is a cross-sectional view showing a process of operating the high vacuum prevention apparatus of the scroll compressor of the present invention.

** Description of symbols for the main parts of the drawing **

2: fixed scroll 110: valve housing

111: valve accommodation space 112a, 112b: stopper

113: through hole 120: check valve

121a, 121b: Stopping surface 122a, 122b: Gas receiving groove

123a, 123b: gas flow groove 124: hinge groove

130: fixing bolt 141: suction pressure hole

142: intermediate pressure hole 143: discharge pressure hole

S1: suction pressure zone S2: medium pressure zone

S3: discharge pressure range

In order to achieve the object of the present invention, to form a plurality of compression chambers that move continuously with the rotating scroll and to form a communication hole in the compression chamber to communicate with the compression chamber of the intermediate pressure region and to communicate with the suction pressure region. A fixed scroll forming a suction pressure hole and a predetermined valve accommodation space, and fixed to the fixed scroll so as to accommodate the intermediate pressure hole and the suction pressure hole in the valve accommodation space, and differentially between the intermediate pressure hole and the suction pressure hole. The valve housing which forms the discharge pressure hole to communicate with the valve housing, and is rotatably inserted into the valve housing space of the valve housing to selectively communicate with each hole while rotating in accordance with the pressure of the fluid flowing through the holes into the valve housing space. A high vacuum prevention apparatus for a scroll compressor, comprising a check valve formed in a plate shape, is provided. The.

EMBODIMENT OF THE INVENTION Hereinafter, the high vacuum prevention apparatus of the scroll compressor by this invention is demonstrated in detail based on one Example shown in an accompanying drawing.

Figure 4 is a longitudinal sectional view showing a part of the scroll compressor of the present invention, Figure 5 is a longitudinal sectional view showing an enlarged high vacuum prevention apparatus in the scroll compressor of the present invention, Figure 6 is an exploded perspective view showing a high vacuum prevention apparatus in the scroll compressor of the present invention. .

As shown in the drawing, the scroll compressor including the high vacuum preventing device according to the present invention includes a main frame 1 fixed to the inner circumferential surface of the casing C, and a drive motor M fixedly installed below the main frame 2. ), A fixed scroll (2) fixedly mounted on the upper surface of the main frame (1), a rotating scroll (3) forming a plurality of compression chambers (P) continuously engaged with the fixed scroll (2), A high and low pressure separating plate 5 for sealingly coupling to the upper surface of the fixed scroll 2 and the inner circumferential surface of the casing C and partitioning the inside of the casing C into the suction pressure region S1 and the discharge pressure region S3; It is provided on one side of the upper surface of the fixed scroll (3) includes a valve housing 110 and a check valve 120 to prevent the vacuum operation of the compressor.

Fixed scroll (2) is a plurality of compression chamber (P) intermediate pressure hole (P) formed through the compression chamber (P) constituting the intermediate pressure area (S2) to the back of the fixed scroll (2), and high and low pressure separation plate And a suction pressure hole 141 which penetrates to the rear surface of the fixed scroll 2 in the suction pressure region S1 partitioned by (5).

When the intermediate pressure hole 142 and the suction pressure hole 141 are formed with a phase difference of about 180 ° around the rotation shaft of the check valve 120 described above, the behavior of the check valve 120 is considered in consideration of minute leakage of gas. It is preferable to stabilize.

The valve housing 110 includes the intermediate pressure hole 142 and the suction pressure hole 141 together with a discharge pressure hole 143 communicating with the discharge pressure area S3. The valve accommodation space 111 is formed in the shape of a "fan-shape" so as to accommodate, and one side of the valve accommodation space 111 is independently contacted with both stop surfaces 121a and 121b of the check valve 120 to be described later. The stop protrusions 112a and 112b which limit the rotation of the check valve 120 are formed, and the valve housing 110 is formed at the center point of the stop protrusions 112a and 112b which is the center of the valve accommodation space 111. Through the fastening through the fixed scroll (2) to secure the valve housing 110 to the fixed scroll (2), and also through the fixing bolt 130 for supporting the rotational movement of the check valve 120 through the through hole ( 113).

In addition, the discharge pressure hole 143 corresponds to the suction pressure hole side stop portion 112a when the middle pressure hole side stop portion 112b and the corresponding one side stop surface 121b of the check valve 120 are in contact with each other. It is preferable to form so as to be located between the other stop surface (121a) of the check valve 120.

The check valve 120 is formed so that the intermediate pressure hole 142 and the suction pressure hole 141 have a phase difference of approximately 180 ° as described above, so that the check valve 120 is the intermediate pressure hole 142 and the suction pressure. In order to open and close the hole 141, it is preferable that both of the stop surfaces 121a and 121b are formed in a fan shape having a phase difference of at least 180 degrees.

In addition, the suction pressure side gas accommodation grooves 122a and the intermediate pressure side gas accommodation grooves respectively accommodating the intermediate pressure holes 142 and the suction pressure holes 141 around both of the stop surfaces 121a and 121b of the check valve 120. An intermediate pressure side gas flow groove that forms a gas 122b and guides the gas to each side of the stop protrusions 112a and 112b from the respective gas accommodation grooves 122a and 122b to the stop surfaces 121a and 121b. Suction pressure side gas flow path grooves 123a for guiding the gas introduced from the 123b and the discharge pressure hole 143 into the suction pressure hole 141 are respectively formed in communication with each other.

In addition, the intermediate pressure side gas flow path groove 123b has a relatively high pressure medium pressure so as to prevent the check valve 120 from being rotated back during operation so that the discharge pressure hole 143 and the suction pressure hole 141 communicate with each other. The intermediate pressure side gas accommodation groove 122b is partially overlapped with the intermediate pressure hole 142 so that the check valve 120 can be pushed back by flowing into the intermediate pressure side gas accommodation groove 122b through the intermediate pressure hole 142. It is preferable to expand toward the side.

In the figure, 2b is an inlet, 2c is an outlet, 4 is a rotating shaft, 6 is a check valve assembly, 124 is a hinge groove, DP is a discharge pipe, and SP is a suction pipe.

The high vacuum prevention apparatus of the scroll compressor of the present invention as described above operates as follows.

That is, when the compressor stops and starts operation, as shown in FIG. 7, the intermediate pressure side stop surface 121b of the check valve 120 is in contact with the intermediate pressure side stopper 112b of the valve housing 110. The pressure of the compression chamber in the pressure region S2 becomes higher than the pressure in the discharge pressure region S3, and the gas receiving groove in the intermediate pressure side of the check valve 120 is provided through the intermediate pressure hole 142 of the fixed scroll 2. Compressed gas of the compression chamber introduced into the 122b pushes the check valve 120, and the check valve 120 rotates around the fastening bolt 130 and the hinge groove 124 to discharge pressure as shown in FIG. The suction pressure side stop surface 121a is kept in contact with the suction pressure side stopper 112a of the valve housing 110 while blocking the hole 143.

In this process, the check valve 120 closes both of the stop surfaces 121a and 121b of the check valve 120 to block both the intermediate pressure hole 142 and the suction pressure hole 141, so that the refrigerant gas is the suction pressure region ( S1) flows into the compression chamber P, which is the intermediate pressure region S2, is compressed, and is discharged through the discharge port 2c to the discharge pressure region to maintain a normal operating state.

Next, in the process of continuously operating the compressor, a part of the compressed gas in the discharge pressure region S3 penetrates between the valve housing 110 and the check valve 120 through the discharge pressure hole 143, and the compressed gas is infiltrated. When a predetermined amount or more flows into the suction pressure side gas flow groove 123a and the suction pressure side gas receiving groove 122a, the check valve 120 is reversely rotated as shown in FIG. 9 to open the discharge pressure hole 143 and the suction pressure hole 141. While the check valve 120 is rotating in reverse, the expansion portion (unsigned) of the intermediate pressure side gas flow path groove 123b communicates with the intermediate pressure hole 142 so that a relatively large amount of pressure from the compression chamber P can be obtained. The check valve 120 is rotated forward while the compressed gas is introduced to block the discharge pressure hole 143 and the suction pressure hole 141.

Next, in the case of the aforementioned high compression ratio or the pump-down operation, as the new fluid does not flow into the compression chamber P, the pressure in the compression chamber P, which is the intermediate pressure region S2, drops rapidly, while the discharge pressure is reduced. Since the pressure in the region S3 becomes relatively high, a part of the compressed gas rapidly flows into the suction pressure side gas flow groove 123a and the suction pressure side gas receiving groove 122a through the discharge pressure hole 143 to check valve 120. Reverse). At this time, there is no inflow of compressed gas into the intermediate pressure side gas flow groove 123b and the intermediate pressure side gas receiving groove 122b, thereby preventing the reverse rotation of the check valve 120. As a result, the discharge pressure hole 143 is opened, and the discharge pressure hole 143 and the suction pressure hole 141 communicate with each other so that the compressed gas in the discharge pressure area S3 is introduced back into the suction pressure area S1, thereby increasing the high vacuum of the compressor. To prevent driving.

In this way, not only the design of the check valve is easy, but also the compressor performance can be improved by preventing the compressed gas in the discharge pressure region from leaking into the suction pressure region during normal operation.

The high vacuum prevention apparatus of the scroll compressor according to the present invention is characterized in that the check valve rotates in accordance with the pressure difference between the suction pressure region, the intermediate pressure region and the discharge pressure region to discriminate each suction pressure hole, the intermediate pressure hole and the discharge pressure hole. In this way, not only the design of the check valve is easy but also the opening and closing operation of the check valve is precisely performed, thereby preventing the compressed gas in the discharge pressure region from leaking into the suction pressure region during normal operation, thereby improving the compressor performance.

Claims (6)

A fixed scroll which forms a plurality of compression chambers continuously moving together with the turning scroll and forms an intermediate pressure hole in communication with the compression chamber in the intermediate pressure region, and a suction pressure hole in communication with the suction pressure region; , A valve housing having a predetermined valve accommodation space, fixed to a fixed scroll to accommodate the intermediate pressure hole and the suction pressure hole in the valve accommodation space, and forming a discharge pressure hole to differentially communicate the intermediate pressure hole and the suction pressure hole. and, And a check valve rotatably inserted into the valve housing space of the valve housing and formed in a plate shape so as to selectively communicate with each hole while rotating in accordance with the pressure of the fluid flowing into the valve housing space through the holes. High vacuum prevention device of scroll compressor. The method of claim 1, The check valve is a high vacuum prevention device of a scroll compressor, characterized in that the hinge groove is formed to be hinged to the hinge protrusion provided in the fixed scroll or the valve housing. The method of claim 2, The check valve has a stop surface on both sides of the hinge groove, and the valve accommodation space has a stop protrusion which protrudes at a predetermined interval from both stop surfaces of the check valve to limit the rotation of the check valve. High vacuum prevention device of scroll compressor. The method of claim 3, When the one stop surface of the check valve is in contact with the one side of the stopper portion, the high pressure preventing device of the scroll compressor, characterized in that the discharge pressure hole is formed between the other stopper and the other side of the stopper corresponding to the stopper. . The method of claim 4, wherein The check valve includes an intermediate pressure side gas accommodation groove and an suction pressure side gas accommodation groove formed to communicate with the intermediate pressure hole and the suction pressure hole, respectively, and an intermediate pressure side gas that guides the gas accommodated in the intermediate pressure side gas accommodation groove to one side of the stop protrusion. And a suction gas side gas flow path for guiding compressed gas through the flow path groove and the discharge pressure hole to the suction pressure hole. The method of claim 5, The gas pressure groove of the intermediate pressure side is formed in such a way as to partially overlap with the intermediate pressure hole during the reverse rotation of the check valve to prevent the check valve from rotating in the reverse direction during operation. .